An airmail etiquette, often shortened to just etiquette, is a label used to indicate that a letter is to be sent by airmail. == Etymology == The term "airmail etiquette" derived from the French word étiquette ("label, sticker"), from which is also derived the English word etiquette ("rules of behavior").
An airmail etiquette, often shortened to just etiquette, is a label used to indicate that a letter is to be sent by airmail. == Etymology == The term "airmail etiquette" derived from the French word étiquette ("label, sticker"), from which is also derived the English word etiquette ("rules of behavior").
Source: Wikipedia "Airmail etiquette" · CC BY-SA 4.0
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